Loose leaf binder mechanism



Get. 13, 1931.

Filed May 31, 1930 Patented Oct. 13, 19,31

UNITED STATES JAMES c. DAWSON, 0F WEBSTER. GRovEs, MrsfsoUnrQAssIe-No'n 'ro 'SE1-MA N.' inietvrvsoiv,V -oF WEBSTER GRovEs; Missoula; Y' i LoosE LEAF VBINDERtimoriAivrsMj Y Application filedv may 31,

VThe objects of the inventionA are to p rovidesimple and cheap means for `securing the heads of the binder post in the cooperatingv binder bar to Fig. l is a perspective view illustrating the apparatus;

Fig. 2 is a detail top view of one end of the U-shaped binder bar;

Fig. 3 is a vertical longitudinal section through one end of the binder;

Fig. 4 shows a detail plan of an alternative form of screw headabutment; and* Fig. 5 is a'section along'the line 5`5 oflU-section, one side of which, 16, is provided with aperturesV 18, y18V, through which the heads of the screwsmay pass, while the opposing side 17 forms a stop limiting further insertion of the screw.

The means for locking` the binder consists kof a locking bar 19.` Rivets 21, 21,' joining` the two sides of the yU-binder bar passing `maintain the bar through'elongated slots 22 inthe locking bar within the U.

Other slots also formed in the bar 19 bearv dental dislodgement of the lock is thus prevented.

The shank of the screw is necessarily smaller than the post, and the head ofthe screw mustV .pass throughfthe holes in the Y paper and is, preferably equal in diameter ingthe rimvof the socket may be solid and permanently but slidably iesorsenaly No.'v 45s-,449.. l f

tothe post. `llheapertures 18,118,1nust give. ,i clearancefto the screw head. i Consequently, the two bars now locked togethergw'ould haveV a longitudinal play equal to the difference -in diameter betweenthe screw@shank'anditheY l 1 post. By providing a buttress closely surrounding the peripheryv of the head,.a socket isformed ywhich lprevents thef headfrom moving' in anydirection. Y AThe buttress formformed,y into or aiiXed to thek U-bar wall 17 in any suitable manner, or the'rim'mayl be discontinuous, inwhichcase thesocket may i be easily formed by thrusting'up the fingers apart. I prefer the klatter eX- pedient.; j.. l

If now'fthe fingers aremadeequalto, or but ,-slightlylonger than the thickness of the screw head,.they`wll,also servethe function 1 oflspacers maintainingthevlocking barso spaced in relation 5to the opposing side 17- that` clearance for the screw head. isalwaysVY providedubetween the locking bar 19 and the wallsV `Consequently, when the post is -Y in#l serted,.th,e slotportion24 ofthe lock will v`al,-`

rways pass :under they screw head,` engage-the Ashank and'lockithe binder fast.

In Fig.4,fan alternative formhof screwA` head.; abutment is 'shown which consists of 'al' washer like member. 28y welded or otherwise affixed to the inner face of the side 17 @The hole 291providedinthe washer exceeds but slightly the diameter of lthe head ofthe screwand holds i the screw from. .any A"displacement inthemannerpreviously discussed. v

rlhatjIclaim,fis'therefore,iis; w

1. In a pos-ttype binder, a posthaving a stern`v portion, a. reduced portion,'wan'd ahead portion,;a.binder barbearing a'socket a-dapted to engage the periphery of the head po'rsie tion, a locking bar slidably mounted on the" binder bar bea-ring a slot adapted to clear the maintained in spaced relation with respect to the binder bar by engagement with the outer end of the socket. l Y

2. In a post type binder, a post having aA i stem portion, a reduced portion and` a head portion, a binder bar bearing a plurality of projections protruding from its face a distance substantially equal to the height of the head portion, and a locking bar slidably maintained against the projections and held in spaced `relation from the binder-har by the projections;

3. In a post type hinder, a post having. a stem portion, a` reduced portion, and a head 1U portion Ushaped binder` bagr` hav'ingi :on

one side a perforation adapt'edt'clarthe" head portion, and having af plurality of fingers projecting inwardly from the other side and adapted to engage'thepeI-'iphery'of L', the head portion, a locking bar within ,the Uisction having perforation adapted to deaf `heid portion, and a, communicating site 'ddapred'tdengage the redneed perdon, maintained inr spa-ced relationY with respectto SO the dnpeffdted side ofthe U-binder bai-by the fngrs projecting therefrom,

4; Inl a; pest binder, a past having 'a stein portion 'a rediiced eXtensible jgnortion ay head,- a VU-shalped binder barloear- 2;, ing Qn-One side d .p'efertion adapted to @leaf the hedd,-a socket adapt-ed te engage the pripherj of the'he-ad Iprojecting inwardly ioin tlie other side a di'stne atlasteqiial to the height of themed, a locking' bar Within 30 tle USCtiOI-l nidilitained against' tli ddOf the socket, and provided with a keyhole#y shaped slot adapted@ engage the head,r

5. In` al loose lef bilid","a binder bti', a p's'tg-apl-Lirality 'of projections onthe face 35 of the br adapted to' engage 4the 'periphery O'f the postal', itsteriinils,'t redced portion on :the pster. d point removed from said terminus a distance-@dear to the height of the projections,- and d leek-ing' bar slidably ,w niintain'e'dagainst the projections and dptelt'egge the fredii/Ced prtif th post.

45, peper-holding 'post-s, a Ushaped binder bar having Vsockets comprising inwardly directed bttsses aclaptedftofeiff the heads of the posts and to prevent vnotion of the -hea'ds'i'naintaind therein, and ni'fs n- 50 gaging a rediifced portion on the posts, and maintained v'vithin tlieUeshape'd section to lck the posts Within Vthe sockets; d j

In tstiniony whereof I afiixniysignatnre' JAMES C; DAWSN. 

